探究PERS定向散射机理及其在等离激元增强光谱学中的应用,对于发展超高灵敏界面增强光谱技术极为重要。目前大多数研究将PERS定向散射解释为金属界面SPP模式的激发,或者金属纳米结构中各类LSPR模式的相干叠加。而在金属纳米结构与其支撑界面组成的复杂体系中，LSPR和SPP的耦合作用使得PERS定向散射机理异常复杂。本项目拟通过研究金属纳米结构在固-气、固-液以及液-液等界面各种表面等离激元共振模式的识别与相互作用，探索金属纳米结构的LSPR模式和界面SPP模式的本质特点以及对PERS定向散射的相对贡献和综合作用机理，促进LSPR和SPP机理的统一理论研究，深入探究量子效应对PERS定向散射的具体影响，并将完备的PERS定向散射机理应用到等离激元增强非线性光谱等界面增强光谱学领域。该研究对于优化PERS技术，构建高效的各类界面增强光谱仪器具有重要的实际意义。

Exploring the directional emission of plasmon-enhanced Raman spectroscopy (PERS) and its applications in plasmon-enhanced spectroscopy is extremely important for the development of interface-enhanced spectrum technology with ultra-high sensitivity. Most present studies interpret directional emission of PERS as the excitation of surface plasmon polariton (SPP) modes on metal interface or the coherent superposition of various localized surface plasmon resonance (LSPR) modes in metal nanostructure. But in the complex system that consists of metal nanostructure and its supporting interface, the coupling effect between LSPR and SPP makes the mechanism of PERS directional scattering extremely complex. By studying the recognition and interactions of various surface plasmon resonance (SPR) modes while the metal nanostructure is located at the solid-gas, solid-liquid and liquid-liquid interfaces, this project is committed to explore the essential characters of LSPR modes in metal nanostructure and SPP modes at interface structure, and their relative contributions as well as interactive effects to directional scattering of PERS. The unified theoretical study of LSPR and SPP mechanisms can be finally promoted. We further to deeply explore the concrete effects of quantum effect on the directional scattering of PERS, and apply the complete mechanism to interface-enhanced spectroscopy, such as plasmon-enhanced nonlinear spectroscopy (PENS). The study has a practical significance to optimize PERS technology and construct interface-enhanced spectrum instrument with high efficiency.